package com.ly.common.utils.http;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ConnectException;
import java.net.SocketTimeoutException;
import java.net.URL;
import java.net.URLConnection;
import java.security.cert.X509Certificate;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

import com.ly.common.constant.Constants;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 通用http发送方法
 * @author ruoyi
 */
public class HttpUtils {
    private static final Logger log = LoggerFactory.getLogger ( HttpUtils.class );

    /**
     * 向指定 URL 发送GET方法的请求
     * @param url   发送请求的 URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendGet (String url, String param) {
        return sendGet ( url, param, Constants.UTF8 );
    }

    /**
     * 向指定 URL 发送GET方法的请求
     * @param url         发送请求的 URL
     * @param param       请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @param contentType 编码类型
     * @return 所代表远程资源的响应结果
     */
    public static String sendGet (String url, String param, String contentType) {
        StringBuilder result = new StringBuilder ();
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            log.info ( "sendGet - {}", urlNameString );
            URL realUrl = new URL ( urlNameString );
            URLConnection connection = realUrl.openConnection ();
            connection.setRequestProperty ( "accept", "*/*" );
            connection.setRequestProperty ( "connection", "Keep-Alive" );
            connection.setRequestProperty ( "user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)" );
            connection.connect ();
            in = new BufferedReader ( new InputStreamReader ( connection.getInputStream (), contentType ) );
            String line;
            while ( ( line = in.readLine () ) != null ) {
                result.append ( line );
            }
            log.info ( "recv - {}", result );
        } catch ( ConnectException e ) {
            log.error ( "调用HttpUtils.sendGet ConnectException, url=" + url + ",param=" + param, e );
        } catch ( SocketTimeoutException e ) {
            log.error ( "调用HttpUtils.sendGet SocketTimeoutException, url=" + url + ",param=" + param, e );
        } catch ( IOException e ) {
            log.error ( "调用HttpUtils.sendGet IOException, url=" + url + ",param=" + param, e );
        } catch ( Exception e ) {
            log.error ( "调用HttpsUtil.sendGet Exception, url=" + url + ",param=" + param, e );
        } finally {
            try {
                if ( in != null ) {
                    in.close ();
                }
            } catch ( Exception ex ) {
                log.error ( "调用in.close Exception, url=" + url + ",param=" + param, ex );
            }
        }
        return result.toString ();
    }

    /**
     * 向指定 URL 发送POST方法的请求
     * @param url   发送请求的 URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost (String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        StringBuilder result = new StringBuilder ();
        try {
            String urlNameString = url;
            log.info ( "sendPost - {}", urlNameString );
            URL realUrl = new URL ( urlNameString );
            URLConnection conn = realUrl.openConnection ();
            conn.setRequestProperty ( "accept", "*/*" );
            conn.setRequestProperty ( "connection", "Keep-Alive" );
            conn.setRequestProperty ( "user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)" );
            conn.setRequestProperty ( "Accept-Charset", "utf-8" );
            conn.setRequestProperty ( "contentType", "utf-8" );
            conn.setDoOutput ( true );
            conn.setDoInput ( true );
            out = new PrintWriter ( conn.getOutputStream () );
            out.print ( param );
            out.flush ();
            in = new BufferedReader ( new InputStreamReader ( conn.getInputStream (), "utf-8" ) );
            String line;
            while ( ( line = in.readLine () ) != null ) {
                result.append ( line );
            }
            log.info ( "recv - {}", result );
        } catch ( ConnectException e ) {
            log.error ( "调用HttpUtils.sendPost ConnectException, url=" + url + ",param=" + param, e );
        } catch ( SocketTimeoutException e ) {
            log.error ( "调用HttpUtils.sendPost SocketTimeoutException, url=" + url + ",param=" + param, e );
        } catch ( IOException e ) {
            log.error ( "调用HttpUtils.sendPost IOException, url=" + url + ",param=" + param, e );
        } catch ( Exception e ) {
            log.error ( "调用HttpsUtil.sendPost Exception, url=" + url + ",param=" + param, e );
        } finally {
            try {
                if ( out != null ) {
                    out.close ();
                }
                if ( in != null ) {
                    in.close ();
                }
            } catch ( IOException ex ) {
                log.error ( "调用in.close Exception, url=" + url + ",param=" + param, ex );
            }
        }
        return result.toString ();
    }

    public static String sendSSLPost (String url, String param) {
        StringBuilder result = new StringBuilder ();
        String urlNameString = url + "?" + param;
        try {
            log.info ( "sendSSLPost - {}", urlNameString );
            SSLContext sc = SSLContext.getInstance ( "SSL" );
            sc.init ( null, new TrustManager[]{new TrustAnyTrustManager ()}, new java.security.SecureRandom () );
            URL console = new URL ( urlNameString );
            HttpsURLConnection conn = (HttpsURLConnection) console.openConnection ();
            conn.setRequestProperty ( "accept", "*/*" );
            conn.setRequestProperty ( "connection", "Keep-Alive" );
            conn.setRequestProperty ( "user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)" );
            conn.setRequestProperty ( "Accept-Charset", "utf-8" );
            conn.setRequestProperty ( "contentType", "utf-8" );
            conn.setDoOutput ( true );
            conn.setDoInput ( true );

            conn.setSSLSocketFactory ( sc.getSocketFactory () );
            conn.setHostnameVerifier ( new TrustAnyHostnameVerifier () );
            conn.connect ();
            InputStream is = conn.getInputStream ();
            BufferedReader br = new BufferedReader ( new InputStreamReader ( is ) );
            String ret = "";
            while ( ( ret = br.readLine () ) != null ) {
                if ( ret != null && ! "".equals ( ret.trim () ) ) {
                    result.append ( new String ( ret.getBytes ( "ISO-8859-1" ), "utf-8" ) );
                }
            }
            log.info ( "recv - {}", result );
            conn.disconnect ();
            br.close ();
        } catch ( ConnectException e ) {
            log.error ( "调用HttpUtils.sendSSLPost ConnectException, url=" + url + ",param=" + param, e );
        } catch ( SocketTimeoutException e ) {
            log.error ( "调用HttpUtils.sendSSLPost SocketTimeoutException, url=" + url + ",param=" + param, e );
        } catch ( IOException e ) {
            log.error ( "调用HttpUtils.sendSSLPost IOException, url=" + url + ",param=" + param, e );
        } catch ( Exception e ) {
            log.error ( "调用HttpsUtil.sendSSLPost Exception, url=" + url + ",param=" + param, e );
        }
        return result.toString ();
    }

    private static class TrustAnyTrustManager implements X509TrustManager {
        @Override
        public void checkClientTrusted (X509Certificate[] chain, String authType) {
        }

        @Override
        public void checkServerTrusted (X509Certificate[] chain, String authType) {
        }

        @Override
        public X509Certificate[] getAcceptedIssuers () {
            return new X509Certificate[]{};
        }
    }

    private static class TrustAnyHostnameVerifier implements HostnameVerifier {
        @Override
        public boolean verify (String hostname, SSLSession session) {
            return true;
        }
    }
}